Ezra arrives on the scene...
שבתחלה כשנשתכחה תורה מישראל עלה עזרא מבבל ויסדה חזרה ונשתכחה עלה הלל הבבלי ויסדה חזרה ונשתכחה עלו רבי חייא ובניו ויסדוה
For in ancient times when the Torah was forgotten from Israel, Ezra came up from Babylon and established it. [Some of] it was again forgotten and Hillel the Babylonian came up and established it. Yet again was [some of] it forgotten, and R. Hiyya and his sons came up and established it
The Amidah/Shmoneh Esreh prayer is attributed to the Great Assembly at the time of Ezra (480-440 BCE). He was very instrumental to the way Judaism is practiced today, including (according to the Talmud) the reading of the Torah in public and many other items. Some historians also say that he was the first person to create a Sefer Torah in the way we know it today.
עזרא תיקן להן לישראל שיהו קורין קללות שבתורת כהנים קודם עצרת ושבמשנה תורה קודם ר"ה
Ezra established for Israel that they should read the curses in Leviticus before Shavuot and those in Deuteronomy before Rosh Hashanah. ...
וְהֵיכָן קוֹבְעִים אֶת הַמְּזוּזָה. בְּתוֹךְ חָלָל שֶׁל פָּתַח בַּטֶּפַח הַסָּמוּךְ לַחוּץ בִּתְחִלַּת שְׁלִישׁ הָעֶלְיוֹן שֶׁל גֹּבַהּ הַשַּׁעַר. וְאִם קְבָעָהּ לְמַעְלָה מִזֶּה כְּשֵׁרָה. וְהוּא שֶׁיַּרְחִיקֶנָּה מִן הַמַּשְׁקוֹף טֶפַח. וְצָרִיךְ לְקָבְעָהּ עַל יְמִין הַנִּכְנָס לַבַּיִת וְאִם קְבָעָהּ מִשְּׂמֹאל פְּסוּלָה. וּבַיִת שֶׁל שֻׁתָּפִין חַיָּב בִּמְזוּזָה:
Where is the Mezuzah to be fixed? Within the width of the doorpost, a hand-breadth from the external edge at a height of a third of the elevation of the entrance, counting from the top. If placed higher it is fit in position, provided that it is a hand-breadth lower than the lintel. It should be fixed on the right side of one entering; if placed on the left side, it is unfit for use. A house owned by partners requires a Mezuzah.